However, the Triple Entente, unlike the Triple Alliance or the Franco-Russian Alliance, was not an alliance of mutual defense. Thus, Britain felt free to make its own foreign policy decisions in the 1914 July Crisis.

The situation in the Balkans, especially in the wake of the Serbo-Bulgarian War and the 1878 Treaty of Berlin, which made Russia feel cheated of its gains made in the Russo-Turkish War, prevented the League from being renewed in 1887. In an attempt to stop Russia from allying with France, Bismarck signed the secret Reinsurance Treaty with Russia in 1887. This treaty assured that both parties would remain neutral if war broke out. The alliance between Russia and France and Bismarck's exclusion of Russia from the German financial market in 1887 prevented the treaty from being renewed in 1890, ending the alliance between Germany and Russia.[5]

In 1904, Britain and France signed a series of agreements, the Entente cordiale, mostly aimed toward resolving colonial disputes. That heralded the end of British "splendid isolation" and was partly a response to growing German antagonism, as expressed in the expansion of the Kaiserliche Marine (Imperial Navy) to become a battle fleet that could threaten the supremacy of the British Royal Navy.

The Entente, unlike the Triple Alliance and the Franco-Russian Alliance, was not an alliance of mutual defence and so Britain was free to make its own foreign policy decisions in 1914. As British Foreign Office Official Eyre Crowe minuted, "The fundamental fact of course is that the Entente is not an alliance. For purposes of ultimate emergencies it may be found to have no substance at all. For the Entente is nothing more than a frame of mind, a view of general policy which is shared by the governments of two countries, but which may be, or become, so vague as to lose all content".[8]

In the last decade of the nineteenth century, Britain continued its policy of "splendid isolation", with its primary focus on defending its massive overseas empire. However, by the early 1900s, the German threat had increased dramatically, and in Britain thought it was in need of allies. For most of the 19th century, Britain had regarded France and Russia as its two most dangerous rivals, but with the growing threat of Germany, policy began to change for several reasons:

France and Britain had signed five separate agreements regarding spheres of influence in North Africa in 1904, the Entente cordiale. The Tangier Crisis later encouraged co-operation between the two countries from their mutual fear of apparent German expansionism.

Russia was defeated in the Russo-Japanese War, which resulted in less concern over Russian imperialism and encouraged Russia to secure its position elsewhere. France was already allied to Russia in the Dual Alliance.

Britain was frightened about the rising threat of German imperialism. Kaiser Wilhelm II had announced to the world his intentions to create a global German empire and to develop a strong navy. Britain, traditionally having control of the seas, saw that a serious threat to its own empire and navy.

France, worried about the escalating military development of Germany, began building up its own war industries and army to deter to German aggression. Also, France developed a strong bond with Russia by ratifying the Franco-Russian Alliance, which was designed to create a strong counter to the Triple Alliance. France's main concerns were to protect against an attack from Germany and to regain Alsace-Lorraine.

A 1914 Russian poster in which the upper inscription reads "agreement". The uncertain Britannia (right) and Marianne (left) look to the determined Mother Russia (centre) to lead them in the coming war.

Russia had by far the largest manpower reserves of all the six European powers, but it was also the most backward economically. Russia shared France's worries about Germany. After the Germans started to reorganise the Ottoman army, Russia feared that they would come to control the Dardanelles, a vital trade artery that carried two fifths of Russia's exports.[10]

There was also Russia's recent rivalry with Austria-Hungary over the spheres of influence in the Balkans.

Although it was perceived as useless during the war with Japan, the alliance was valuable in the European theatre. Russia also signed the Anglo-Russian Convention of 1907 with Britain to counteract the threat of the Triple Alliance.

The alignment of the autocratic Russian Empire with Europe's two largest democracies was controversial on both sides. Many Russian conservatives mistrusted the secular France and recalled British past diplomatic maneuvers to block Russian influence in the Near East. In turn, prominent French and British journalists, academics and parliamentarians found the reactionary tsarist regime distasteful. Mistrust persisted even during wartime, with British and French politicians expressing relief when Tsar Nicholas II abdicated and was replaced by the Russian Provisional Government after the February Revolution in 1917. An offer of political asylum for the Romanovs was even withdrawn by the British king for fear popular reaction.[11] Also, France never brought up the subject of asylum with the deposed tsar.

Tomaszewski, Fiona. "Pomp, Circumstance, and Realpolitik: The Evolution of the Triple Entente of Russia, Great Britain, and France." Jahrbücher für Geschichte Osteuropas vol. 3 (1999): 362–380. in JSTOR, in English